The Big Bang & physics
These two pieces of evidence support the Big Bang Theory: Cosmic Microwave Radiation and this.
Answer: What is Red Shift?
90% of stars, including our Sun, fall into this stable category on the H-R Diagram.
Answer: What is the Main Sequence?
These four planets are known as "Terrestrial" because they are Earth-like and dense.
Answer: What are Mercury, Venus, Earth, and Mars?
These are the dark, relatively smooth plains found on the surface of the Moon.
Answer: What are Maria?
Our galaxy, the Milky Way, is approximately this many light-years across.
Answer: What is 100,000 light-years?
This is the color of visible light with the longest wavelength and lowest frequency.
Answer: What is Red?
This is a giant cloud of gas and dust where stars are born.
Answer: What is a Nebula?
These are cool, dark areas that appear on the surface of the Sun.
Answer: What are Sunspots?
This type of eclipse happens when the Moon passes directly between the Sun and Earth.
Answer: What is a Solar Eclipse?
This type of galaxy has a shape that is neither spiral nor elliptical.
Answer: What is an Irregular Galaxy?
This type of wave in the electromagnetic spectrum contains the most energy.
Answer: What are Gamma Rays?
These are small, dense stars that are not very bright and make up about 10% of all stars.
Answer: What are White Dwarfs?
This is the hottest planet in our solar system due to a severe greenhouse effect.
Answer: What is Venus?
The Moon is thought to have formed 4.5 billion years ago when Earth collided with an object the size of this planet.
Answer: What is Mars?
This object is so dense that its gravity prevents even light from escaping.
Answer: What is a Black Hole?
This term describes the process of lightweight atomic nuclei combining into heavier nuclei, like Hydrogen into Helium.
Answer: What is Nuclear Fusion?
This massive explosion occurs when the outer portion of a star is blown off.
Answer: What is a Supernova?
This is the bright yellow surface of the sun that we see from Earth.
Answer: What is the Photosphere?
This term refers to the point where the Moon is farthest away from the Earth in its orbit.
Answer: What is Apogee?
This method is used to determine the distance to a star by observing its apparent shift against a distant background.
Answer: What is Parallax?
This specific spectrum appears as a series of bright spectral lines against a dark background
Answer: What is an Emission (or Bright-Line) Spectrum?
This type of graph shows the relationship between a star’s temperature and its absolute magnitude (brightness).
What is the Hertzsprung-Russell (H-R) Diagram?
This theory of the solar system, championed by Copernicus, places the Sun at the center.
Answer: What is Heliocentric?
This is the name for the loose, ground-up rock that covers the Moon's surface.
Answer: What is Regolith?
These stars are used specifically by astronomers to determine the mass of a star.
Answer: What are Binary Stars?